Base Difficulty

Base difficulty: Level 270 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 1493 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
cefr A2 (2 of 6) 2100

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 87.03 731 50% 1075 downrated 2
20th_books 58.47 1062 50% 1598 downrated 2
wiki_math 176.12 462 50% 732 downrated 2
wiki_geography 73.54 1476 50% 1900 downrated 2
wiki_biology 39.15 1765 50% 3530 downrated 1
wiki_modern_life 125.49 592 50% 1020 downrated 2
wiki_arts 61.78 1506 50% 2215 downrated 2
wiki_society 29.00 2408 50% 4816 downrated 1
wiki_linguistics 31.71 1986 50% 3972 downrated 1
wiki_physical_science 258.16 297 50% 506 downrated 2
wiki_history 37.67 1816 50% 3632 downrated 1
early_modern_science 235.97 293 50% 461 downrated 2
religious_translated 32.52 2115 50% 2786 downrated 2
cooking 73.24 1020 50% 1429 downrated 2
legal_scotus 31.67 2199 50% 3336 downrated 2
eu_parliament_debates 80.58 732 50% 1464 downrated 1
openstax_science 307.96 213 50% 365 downrated 2
openstax_society 41.54 2190 50% 3064 downrated 2
wpa_life_histories 44.48 1417 50% 2061 downrated 2

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.